These verses proclaim punishment. Verse twelve distinguishes itself by its content and
it begins with a messenger formula.
Another concludes the section (v.15).
Beginning or ending a section or a speech unit are habitual uses
of these formulae.

The elaborate proposals in BH3 for trimming the one in
v.13, deleting the one in v.15, and moving the one in v.10 into
v.9, as well as dismembering v.12 and relocating the parts before
v.9 and after v.13, draw attention to the problems but do not
solve them.

All in all, there are five such formulae in seven verses. A
concentration like this is rare, but
not unique, in the prophetic corpus.

The placing of these formulae is even more notable
here than their frequency:

The formula (נְאֻם־יְהוָה ne'um yhwh) in
v.10 occurs in the middle of
a phrase. In v.11, there is a second formula, for this same oracle, introducing
the judgment. It is separated from the previous one by only half a line. Just
a line and a half later comes the formula introducing v.12.
This enlarged formula נְאֻם־אֲדֹנָי יְהוִה אֱלֹהֵי הַצְּבָאוֹ (v.13) is unique.

Clearly these exaggerated uses of messenger formulae demand explanation. It
is not necessary to propose textual corruption (as BHK, and to
a lesser extent BHS
and Wolff 190,
199 do), for which there is little evidence. Rather, one can see
in this strange usage a deliberately intrusive rhetorical device.

Thus, the strange positioning and abundance of messenger formulae
stress the nature of the prophet's declaration as "message".
By their striking use, the speaker points to another (Adonai)
as the source of his message.